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GPT

Frontier language model for chat, reasoning and tool use.

Get API keyAPI docs
Modality
Text · Vision
Capacity
Long context window
Output
Text · JSON · tools
Latency
Streaming, low latency
$1.25/1M$1.56/1M20% off
Category
LLM
Provider
OpenAI
Model id
gpt
Billing
Pay-as-you-go
Service advantages
  • 99.9% SLA
  • Official discount
  • Pay-as-you-go
  • Fast delivery
More about pricing

Try it

Type a prompt and preview a sample response. Real runs use your API key — pay only on success.

Input
Try an example
Temperature0.7
Max tokens512

Est. cost: $0.0007 / run

Output
Your result will appear here
Sign in to run for realSign in
Request
curl https://api.modelplex.ai/v1/chat/completions \
  -H "Authorization: Bearer $MODELPLEX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"gpt","messages":[{"role":"user","content":"Explain how a CDN works, in two sentences."}],"temperature":0.7,"max_tokens":512}'

Overview

GPT is OpenAI's language model, available through Modelplex. Frontier language model for chat, reasoning and tool use. Call it with the OpenAI-compatible API — one key, one balance, transparent pricing, and you only pay for what succeeds.

50K+
active developers
99.9%
uptime
2×
faster routing
70%
avg savings

Pricing details

Unit price
$1.25/1M

per 1M tokens

Original price
$1.56/1M
Discount
−20%
Billing
Pay-as-you-go

Prices include the official discount and you're charged only on success — failed generations are free.

Why it stands out

What you can build

Chatbots & assistantsCoding & autonomous agentsRAG & semantic searchSummarization & extractionClassification & moderationContent generation

Up and running in 3 steps

  1. 1

    Create an account

    Sign up and grab free credits — no card required.

  2. 2

    Point the SDK

    Set the base URL and your APIMart key.

  3. 3

    Make a call

    Use the model id and pay only on success.

FAQ

Point the OpenAI SDK at Modelplex, set your key, and use the model id "gpt". The base URL and key are the only change to your code.

$1.25/1M, billed per call with our standard discount applied up front — and you're only charged on success.

Yes — new accounts start with free credits, so you can try GPT before adding a balance.

Served on a 99.9% uptime target with automatic same-kind fallback if an upstream has a hiccup.

Yes. It's drop-in OpenAI-compatible — no code changes beyond the base URL and key.

Yes — set stream: true and tokens arrive server-sent as they're generated, exactly like the OpenAI API.

GPT handles a large context for long documents and codebases — see the docs for the exact token limit.

Yes, where the model supports it: pass tools in the request and handle the tool calls returned in the response.

Per-key rate limits you set from the console, with sensible defaults on every new key. Need more headroom? Just ask support.

Calls are served from regional infrastructure on a 99.9% uptime target, and your inputs and outputs are never used to train models.

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